Concrete-mixer.



RRBOLTE. CONCRETE MIXER.

APPLIGATION FILED SEPT. 9, 1911.

1,045,117. Patented Nov. 26, 1912.

Y will@ IAT@ PATENT FFIQE,

EDWARD F. BOITE, OF CHICAGO, ILLINOIS, ASSIG-TSVOR F ONE-HALF 'IOTI-IEODORE I-I. BOLTE, 0F KEARNEY, NEBRASKA.

CONCRETEeMIXER.

Specification of Letters Patent.

lPatented Nov. 26,19%?.

To all whom it may concern:

Be it known that I, EDWARD F. BOLTE, a citizen of the United States,residing at Chicago, in the county of Cook and State of Illinois, haveinvented certain new and useful Improvements in Concrete-Mixers; and Ido hereby declare the following to be a full, clear, and exactdescription of the invention, such as will enable others skilled in theart to which it appertains to make and use the same.

My invention relates to concrete mixers, and generally, to that typewherein approximately horizontal rotary drums are used to mixA togethercement, sand and gravel or rock.

Generally stated, the invention consists in providing the drum on itsinterior surface with one or more cables, preferably in the form ofchains, connected thereto at certain points, with their main portionsfree for movements on the inner surface of the drum.

The invention is illustrated in the accompanying drawings wherein likecharacters indicate like parts throughout the several views.

Referring to the drawings, Figure l is an end elevation showing a drumprovided with chains in accordance with my invention; and Fig. 2 is avert-ical sect-ion taken on the line m2 m2 of Fig. l anddiagrammatically illustrating a portion of the carrier for deliveringmaterials to be mixed, into the receiving end of the drum.

The numeral l indicates an approximately horizontal rotary drum mountedand driven in any suitable way, not necessary for the purpose of thiscase to consider.

The numeral 2 indicates a conveyer belt which runs over a roller 3 andover other suitable guiding and driving means. This belt forms no partof the present invention but serves to illustrate a means for deliveringcement, sand, and gravel or rock into the receiving end of the drum.

A multiplicity of chains a are connected to the interior of the drum, asshown by heavy rivets 5. 'Ihese several chains have a general spiralarrangement and are attached to the drum at several points, asdescribed, and are given considerable slack between the dierent pointsof attachment, so that the loose portions of the chains are adapted tomove on the inner surface of the drum and to and from engagement withthe inner surface of the drum. lVith this arrangement of the chains,when the drum is rotated, the materials to be mixed in the drum will becontinuously carried upward on the rising side of the drum andcontinuously dropped back and continuously worked toward the deliveryend of the drum. The chains at the lower portion of the drum, will, bythe action of gravity, and further, by the weight of the materialsengaged therewith, be tightly pressed against the surface of the drum.As they move upward, the chains will not only raise the material, butwill pass through a certain p0rtion of the same and thereby very greatlyincrease the mixing eliiciency of the drum under rotation. The chains atthe upper part of the drum will, by gravity, be caused to fall away fromthe drum.

Under rotation of the drum, the chains, because of their slack andflexibility, partake of various different movements which keepthemselves and the surface of the drum clean, and thereby elfectuallyprevent the cement and commingled materials from adhering to the innersurface of the drum. This latter noted function is probably the mostimportant function performed by the chains, but the other functionsnoted are highly important. In describing the arrangement of the chainsor cables on the inner surface of the drums, it has been stated, thatthere are a plurality thereof, but, of course, a single chain might berun backward and forward to afford a multiplicity of flexible liftingflights, and this would be, in effect, a plurality thereof. Also, asingle chain arranged to form a single flight might possibly be foundserviceable, and this would be within the scope of my invention.

Chains afford by far the most efficient form of flexible flight andcleaning devices, but any other form of flexible cable, such, forinstance, as wire rope, might, in some instances, be employed toadvantage, and such an arrangement would also be within the scope of myinvention, although not the equivalent of the chains.

That I claim is:

l. In a device of the kind described, a rotary drum having cablesattached to the inner surface of the shell of the said drum withsufficient slack between points of atllo taehment to permit theengagement of the intermediate portions thereof With the shell of saiddrum, said cables traveling With the shell of said drum, substantiallyas described. t

2. In a device of the kind described, a rotary drum provided on itsinner surface with spirally arranged cables attached thereto atdifferent points longitudinally of the drum, and With suiiicient slackbetween points of attachment to permit the engagement of theintermediate portions thereof with the shell of said drum, the saidcables serving as lifting flights and scraping the inner surface of thedrum.L

3. In a device of the kind described, the

combination with an approximately horizon tal rotary drum, of chainsattached to the inner surface of the shell of said drum at differentpoints longitudinally thereof and With sufficient slack between thepoints of attachment to permit the engagement of the intermediateportions *thereof With the shell of said drum, said chains travelingWith the shell of said drum, substantially as described.

In testimony whereof I alix my signature in presence of two Witnesses.

EDWARD F. BOLTE. IVitnesses:

`HARRY D. KILGORE,

F. D. MERCHANT.

Copies of this patent may be obtained for ve cents each, by addressingthe Commissioner of Patents.

Washington, D. C.

